package org.langqiao.string.regex;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class GroupIndexTest {
	public static void main(String[] args) {  
		   String str = "Hello,World! in Java.";  
		   Pattern pattern = Pattern.compile("W(or)(ld!)");  
		   Matcher matcher = pattern.matcher(str);  
		   while(matcher.find()){  
		    System.out.println("Group 0:"+matcher.group(0));//得到第0组——整个匹配  
		    System.out.println("Group 1:"+matcher.group(1));//得到第一组匹配——与(or)匹配的  
		    System.out.println("Group 2:"+matcher.group(2));//得到第二组匹配——与(ld!)匹配的，组也就是子表达式  
		    System.out.println("Start 0:"+matcher.start(0)+" End 0:"+matcher.end(0));//总匹配的索引  
		    System.out.println("start2:"+str.substring(matcher.start(2),matcher.end(2)));
		    System.out.println("Start 1:"+matcher.start(1)+" End 1:"+matcher.end(1));//第一组匹配的索引  
		    System.out.println("Start 2:"+matcher.start(2)+" End 2:"+matcher.end(2));//第二组匹配的索引  
		    System.out.println(str.substring(matcher.start(0),matcher.end(1)));//从总匹配开始索引到第1组匹配的结束索引之间子串——Wor  
		   }  
		}  

}
